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llvm-context: alloca at the function entry if possible (#283)

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Closes  #48

Change the code size test to no longer emit debug info as to get a more
accurate picture.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
This commit is contained in:
xermicus
2025-04-15 15:22:24 +02:00
committed by GitHub
parent 431b5a2ce5
commit 5003f3e9ac
11 changed files with 102 additions and 89 deletions
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crates/llvm-context/src/polkavm/evm/bitwise.rs
+28 -14
View File
@@ -63,7 +63,6 @@ where
let non_overflow_block = context.append_basic_block("shift_left_non_overflow");
let join_block = context.append_basic_block("shift_left_join");
let result_pointer = context.build_alloca(context.word_type(), "shift_left_result_pointer");
let condition_is_overflow = context.builder().build_int_compare(
inkwell::IntPredicate::UGT,
shift,
@@ -73,7 +72,6 @@ where
context.build_conditional_branch(condition_is_overflow, overflow_block, non_overflow_block)?;
context.set_basic_block(overflow_block);
context.build_store(result_pointer, context.word_const(0))?;
context.build_unconditional_branch(join_block);
context.set_basic_block(non_overflow_block);
@@ -81,11 +79,17 @@ where
context
.builder()
.build_left_shift(value, shift, "shift_left_non_overflow_result")?;
context.build_store(result_pointer, value)?;
context.build_unconditional_branch(join_block);
context.set_basic_block(join_block);
context.build_load(result_pointer, "shift_left_result")
let result = context
.builder()
.build_phi(context.word_type(), "shift_left_value")?;
result.add_incoming(&[
(&value, non_overflow_block),
(&context.word_const(0), overflow_block),
]);
Ok(result.as_basic_value())
}
/// Translates the bitwise shift right.
@@ -101,7 +105,6 @@ where
let non_overflow_block = context.append_basic_block("shift_right_non_overflow");
let join_block = context.append_basic_block("shift_right_join");
let result_pointer = context.build_alloca(context.word_type(), "shift_right_result_pointer");
let condition_is_overflow = context.builder().build_int_compare(
inkwell::IntPredicate::UGT,
shift,
@@ -111,7 +114,6 @@ where
context.build_conditional_branch(condition_is_overflow, overflow_block, non_overflow_block)?;
context.set_basic_block(overflow_block);
context.build_store(result_pointer, context.word_const(0))?;
context.build_unconditional_branch(join_block);
context.set_basic_block(non_overflow_block);
@@ -121,11 +123,17 @@ where
false,
"shift_right_non_overflow_result",
)?;
context.build_store(result_pointer, value)?;
context.build_unconditional_branch(join_block);
context.set_basic_block(join_block);
context.build_load(result_pointer, "shift_right_result")
let result = context
.builder()
.build_phi(context.word_type(), "shift_right_value")?;
result.add_incoming(&[
(&value, non_overflow_block),
(&context.word_const(0), overflow_block),
]);
Ok(result.as_basic_value())
}
/// Translates the arithmetic bitwise shift right.
@@ -145,8 +153,6 @@ where
let non_overflow_block = context.append_basic_block("shift_right_arithmetic_non_overflow");
let join_block = context.append_basic_block("shift_right_arithmetic_join");
let result_pointer =
context.build_alloca(context.word_type(), "shift_right_arithmetic_result_pointer");
let condition_is_overflow = context.builder().build_int_compare(
inkwell::IntPredicate::UGT,
shift,
@@ -174,11 +180,9 @@ where
)?;
context.set_basic_block(overflow_positive_block);
context.build_store(result_pointer, context.word_const(0))?;
context.build_unconditional_branch(join_block);
context.set_basic_block(overflow_negative_block);
context.build_store(result_pointer, context.word_type().const_all_ones())?;
context.build_unconditional_branch(join_block);
context.set_basic_block(non_overflow_block);
@@ -188,11 +192,21 @@ where
true,
"shift_right_arithmetic_non_overflow_result",
)?;
context.build_store(result_pointer, value)?;
context.build_unconditional_branch(join_block);
context.set_basic_block(join_block);
context.build_load(result_pointer, "shift_right_arithmetic_result")
let result = context
.builder()
.build_phi(context.word_type(), "shift_arithmetic_right_value")?;
result.add_incoming(&[
(&value, non_overflow_block),
(
&context.word_type().const_all_ones(),
overflow_negative_block,
),
(&context.word_const(0), overflow_block),
]);
Ok(result.as_basic_value())
}
/// Translates the `byte` instruction, extracting the byte of `operand_2`